Davidson, G. (2014). North American tunneling: 2014 proceedings. Society for Mining Metallurgy and Exploration.
Citazione stile Chigago Style (17a edizione)Davidson, Gregg. North American Tunneling: 2014 Proceedings. Colorado: Society for Mining Metallurgy and Exploration, 2014.
Citatione MLA (9a ed.)Davidson, Gregg. North American Tunneling: 2014 Proceedings. Society for Mining Metallurgy and Exploration, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.